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- 저자 : 최석근(Seok-Keun Choi) (검색결과 129 건)
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해안사구 변화 모니터링을 위한 시계열 UAV DEM 표고보정
최석근(Choi, Seok-Keun),이승기(Lee, Soung-Ki),최도연(Choi, Do-Yeon),임희창(Lim, Heechang) 한국측량학회 2023 한국측량학회지 Vol.41 No.6
Due to climate change and coastal development, significant transformations in coastal dunes have increased the demand for continuous monitoring. The usage of UAV (Unmanned Aerial Vehicles) for this purpose has escalated. However, early UAV monitoring methods encountered limitations in the continuous installation and field measurement of GCP (Ground Control Points), necessitating the use of a reference DEM (Digital Elevation Model) for elevation correction. Notably, as the study area includes coastal dunes on islands, which differ from the mainland, long-term monitoring involves substantial costs and manpower for GCP surveying. This research introduces an elevation correction method for monitoring changes in coastal dunes, building upon previous studies. UNET was used to distinguish classes in invariant areas and to extract characteristic values from these areas. These values were normalized using the Z-score to eliminate outliers, and a linear regression formula was applied to adjust the DEM values. Over eight years, 13 sets of orthoimages and DEMs were created, both with and without GCPs. The proposed technique was evaluated by comparing DEMs with GCPs to those corrected using the proposed method without GCPs. Additionally, transects were selected to assess the effectiveness of the proposed monitoring method. This study confirms the feasibility of using the corrected DEM without ground control point data for coastal dune monitoring.
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최석근 ( Seok Keun Choi ),이한복 ( Han Bok Lee ) 충북대학교 건설기술연구소 2011 건설기술논문집 Vol.30 No.2
This study was carried out to examine the safety of slopes and to establish a reinforcement measure as the pithead slope zone at the starting and end points during a tunnel construction work. For this purpose, using on-site surveys and photographic images of the slope zone at the starting and end points of the tunnel, electrical resistivity survey method and on-site face mapping, etc., all sorts of quantitative and qualitative soil engineering properties were analyzed. As a result of a limit equilibrium analysis based on the result of this analysis, both the starting and end points of Chopyeong 1 Tunnel were unstable, the front side of the starting point of Chopyeong 1 Tunnel and that of the end point of Chopyeong 2 Tunnel were examined to be unstable in both the earth and sand and weathered rock layer and the base rock layer, which was analyzed that a comprehensive measure of reinforcing the entire slope would be necessary.
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